Soft bottom mollusc assemblages (gastropoda-bivalvia) in marine shallow waters of the western turkey coast

2296-2304The most dominant family was found to be Rissoidae with 10 species. Of the 105 species obtained stations, the most dominant species was Bittium reticulatum (26%) with 2226 specimens, followed by Mytilus galloprovincialis (11%) with 1022 specimens and Rissoa membranacea (8%) with 713 specimens, respectively. Shannon-Weaver’s Diversity Index (H'), Pielou’s Evenness Index (J’), Soyer’s Frequency Index (F), Bray-Curtis Similarity Index and Pearson's Correlation Analysis were applied to the benthic mollusc fauna. Diversity index values (between 1.71 and 4.43) and evenness index values (between 0.38 and 0.82) were determined in the area. According to Bray Curtis similarity analysis there were 3 distinct species assemblages in the area. The number of individuals, diversity index value, gastropoda and bivalvia species were also positively correlated with temperature

Reproductive biology of the black-striped pipefish Syngnathus abaster Risso, 1827 (Pisces: Syngnathidae) in the Aegean Sea of Turkey

WOS: 000427681400008The paper presents the results of research on the reproductive biology of Syngnathus abaster - a species distributed in Candarli Bay. For this purpose, seine nets were collected from a depth of 0.5-2 m in 15 minute periods between April 2013 and March 2014, and a total of 185 individuals were sampled. It has been determined that 94 individuals (50.81%) were females, 79 were males (42.70%) and 12 were immature (6.49%). The sex ratio was 1: 0.84. The average length values in female, male and immature individuals were 111.5 +/- 7.35, 109.9 +/- 11.08 and 79.8 +/- 5.30 mm, respectively. The maximum mean surface water temperature is in spring and summer seasons. When Gonadosomatic Index (GSI%) values were examined, the spawning period of the species was indicated as spring and summer. Three groups of species were identified as maturing (diameter: 0.61-1.20 mm), mature (diameter: 1.21-1.70 mm) and hydrated oocytes (diameter: 1.71-2.10 mm) in ovaries of female individuals. The number of eggs in the brood pouch of pregnant male fishes was on average 48 (mean +/- SD = 48 +/- 14.09 eggs, range: 23-78 eggs). The hydrated oocyte/total length relationship was: y = 0.8651x - 84.332 (n = 14, r(2) = 0.64) and the number of eggs/total length relationship in the brood pouch of pregnant males was: y = 1.0168x - 67.715 (n = 33, r(2) = 0.58)